AR to ZIP Converter
FileFlip converts AR to ZIP entirely inside your browser, using libarchive compiled to WebAssembly. The file is never uploaded to a server: it is read off your disk, converted on your own machine, and saved back by the browser. That means no file-size limit, no queue and no account.
How do I convert an AR file to ZIP?#
- Drop your AR file onto the converter at the top of this page, or click it to pick one from your computer. You can add as many as you like.
- Leave the target set to ZIP and the conversion starts on its own. FileFlip downloads 1.0 MB of WebAssembly the first time and nothing after that, then runs libarchive on your own machine.
- Save the ZIP file. Your browser writes it straight to your downloads folder, because there was never a server holding it.
Does converting AR to ZIP lose quality?#
No. Converting AR to ZIP does not touch the files inside the archive. Each member is read out and written back byte for byte, so only the wrapper around them changes and nothing is recompressed.
Is it safe to convert AR files online?#
Yes, because nothing is uploaded. FileFlip converts AR files inside the browser tab you already have open, using WebAssembly builds of the same engines a desktop converter would install. Your file is read from your own disk into the page's memory, and no request carrying it is ever made.
You do not have to take that on trust. Open your browser's network panel, run a conversion, and you will see the engine come down and your file go nowhere. There is no upload, no server-side copy, no retention window, and no account tied to what you converted.
How FileFlip works lists every engine, its version and its download size, and shows how to check for yourself that nothing leaves your machine.
What AR to ZIP actually does to the file#
Converting AR to ZIP runs on libarchive, downloads 1.0 MB of WebAssembly the first time and nothing after that, copies the archived files through unchanged, keeps file contents, and drops file timestamps and file permissions.
| Engine | libarchive |
|---|---|
| Conversion path | 2 steps: AR → the unpacked files → ZIP |
| Downloaded to your browser | 1.0 MB, once, then cached by your browser |
| Quality | Lossless, contents copied unchanged |
| You get back | One file |
| Where it runs | On the page's own thread, so a very large file will make the tab wait |
What survives the conversion
| What is in the file | This conversion | Why |
|---|---|---|
| File contents | Kept | Carried through into the converted file. |
| File timestamps | Dropped | The target format has nowhere to put it. |
| File permissions | Dropped | The target format has nowhere to put it. |
Worth knowing before you start:
- the built-in ZIP and TAR writer records no timestamps, permissions, or ownership
- every entry is extracted into memory before anything is written, so a very large archive can exhaust it
- this conversion runs on the page's own thread, so a large file will freeze the tab while it works
What is an AR file?#
An AR file is a Unix archive that concatenates one or more files behind a short per-file header, the format compilers use for static library .a files and that dpkg uses as the outer wrapper of a .deb package.
Reach for ar when linking a static library, where the .a file it produces is what the linker expects, or when inspecting the outer layer of a .deb package.
Convert an AR archive to tar or zip when the files inside need to be handled by tools that do not know the static-library-oriented ar format.
What is a ZIP file?#
A ZIP file is a container introduced by PKWARE in 1989 that holds any number of files and folders, each one compressed and stored as its own separate entry alongside a central directory listing them.
Use ZIP when the archive has to open on any device without the recipient installing anything, or when individual files need to be pulled out rather than the whole archive at once.
Convert away from ZIP when the same files need to be smaller for storage or transfer, since 7z or xz's solid compression usually beats it at the cost of that per-file random access.
AR to ZIP questions people ask#
What is an AR file used for today?
An AR file's two remaining jobs are holding compiled object files as a static library, with the .a extension, and serving as the outer wrapper of a Debian .deb package. Almost nothing else uses the format anymore.
How is an AR archive different from a TAR archive?
Both concatenate files with a header in front of each, but an AR archive has no directory structure and a much smaller fixed header, since it was built for flat collections like object files rather than whole folder trees. Tar became the general-purpose choice while ar stayed specialized.
Why does a .deb package use the ar format?
Debian's package format wraps three items, a version marker and two tarballs, in an ar archive because ar's layout is simple enough to parse without any real library, which keeps tools like dpkg lightweight and lets any ar-aware program open a .deb without understanding Debian packaging at all.
Why can I open one file from a ZIP without extracting the whole thing?
A ZIP archive compresses each file inside it separately and lists them in a central directory at the end, so a tool can jump straight to one entry and decompress only that file. Formats like TAR.GZ compress everything as one continuous stream and don't have this shortcut.